<script>var ctx="${request.getContextPath()}"</script>
<script type="text/javascript" src="${request.getContextPath()}/js/jquery-2.1.4.min.js"></script>
<script type="text/javascript" src="${request.getContextPath()}/js/user/user.js"></script>
<script type="text/javascript" src="${request.getContextPath()}/js/ajaxfileupload.js"></script>
<form method="post" id="submit_form_add">

姓名:<input type="text" name="username">
年龄:<input type="text" name="age">

文件1：<input type="file" name="file1">
文件2：<input type="file" name="file2">
    <button type="button" class="prev btn btn-warning" onclick="submitForm_add();" style="margin-right: 5px; float: right;">
        提交
    </button>
</form>